They just add semantic value, and you can use them to write CSS that gives them visual treatments to match that semantic value.
它们只是添加语义值，您可以使用它们来编写向它们提供视觉处理来匹配该语义值的 CSS。
That information will help you identify the image file or CSS style that controls the visual appearance of that aspect.
该信息将帮助您标识控制这些方面的视觉外观的图像文件或css样式。
CSS has addressed many issues related to window dressing: fonts, spacing, padding, backgrounds, and more-all visual presentation elements.
CSS已解决许多与窗口修饰相关的问题：字体、间距、填充、背景，等等—所有视觉呈现元素。
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